[PATCH RFC 46/77] mlx4: Update MSI/MSI-X interrupts enablement code

Alexander Gordeev
2013-10-02T10:49:02Z

As result of recent re-design of the MSI/MSI-X interrupts enabling
pattern this driver has to be updated to use the new technique to
obtain a optimal number of MSI/MSI-X interrupts required.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
---
drivers/net/ethernet/mellanox/mlx4/main.c | 17 ++++++++---------
1 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index 60c9f4f..377a5ea 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -1852,8 +1852,16 @@ static void mlx4_enable_msi_x(struct mlx4_dev *dev)
int i;

if (msi_x) {
+ err = pci_msix_table_size(dev->pdev);
+ if (err < 0)
+ goto no_msi;
+
+ /* Try if at least 2 vectors are available */
nreq = min_t(int, dev->caps.num_eqs - dev->caps.reserved_eqs,
nreq);
+ nreq = min_t(int, nreq, err);
+ if (nreq < 2)
+ goto no_msi;

entries = kcalloc(nreq, sizeof *entries, GFP_KERNEL);
if (!entries)
@@ -1862,17 +1870,8 @@ static void mlx4_enable_msi_x(struct mlx4_dev *dev)
for (i = 0; i < nreq; ++i)
entries[i].entry = i;

- retry:
err = pci_enable_msix(dev->pdev, entries, nreq);
if (err) {
- /* Try again if at least 2 vectors are available */
- if (err > 1) {
- mlx4_info(dev, "Requested %d vectors, "
- "but only %d MSI-X vectors available, "
- "trying again\n", nreq, err);
- nreq = err;
- goto retry;
- }
kfree(entries);
goto no_msi;
}
--
1.7.7.6